untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

She is besieged on all sides—by her in-laws, by social workers, by untreated psychosis—and yet in possession of a terrible freedom. —Jessica Winter, New Yorker, 8 Oct. 2025

Aqueous Cream and Bio-Oil showed little or no effect, while Strataderm and Alhydran actually reduced hydration compared to untreated skin, which was contrary to expectations. —New Atlas, 6 Oct. 2025

Then mix in the signs of grieving—lethargy, loss of appetite, weight loss, destructive behavior—that, when left untreated, can lead to health complications. —Liz O'Connell, MSNBC Newsweek, 2 Oct. 2025

If left untreated, Crohn's disease can be life-threatening. —Vanessa Etienne, PEOPLE, 29 Sep. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease